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A college student is working on her physics homework in her dorm room. Her room contains a total of 6*10^26 gas molecules. As she works, her body is converting chemical energy into thermal energy at a rate of 125 W. If her dorm room were an isolated system (dorm rooms can certainly feel like that) and if all of this thermal energy were transferred to the air in the room, by how much would the temperature increase in 9.0min?
In a Hall-effect experiment, a current of 2.9 A sent lengthwise through a conductor 0.89 cm wide, 3.1 cm long,, find the drift speed (in m/s) of the charge carriers
Two small identical conducting spheres are placed with their centers 0.40 m apart. One is given a charge of 1.2 10-8 C, the other a charge of -1.6 10-8 C. Find the electrostatic force exerted on one sphere by the other
A power supply maintains a potential difference of 81.5 V across a 1.01-k? resistor. What is the current in the resistor in milliamperes?
A 300 DC power supply has fully charged a 15 mF capacitor. The charged capacitor is connected to a 20 mH inductor. find the magnetic energy in the inductor
The two strands of the helix-shaped DNA molecule are held together by electrostatic forces as shown in the Figure 16-44 in the textbook. Estimate the net force between a cytosine and a guanine
Bob walks 320 south, then jogs 450southwest, then walks 320 in a direction 35east of north. Find the direction of the displacement that will return Bob to his starting point by the most direct route
Because of dissipative forces, the amplitude of an oscillator decreases 5.00% in 10 cycles. By what percentage does its energy decrease in ten cycles
A pipe 0.026 m in diameter and 0.22 m long can transfer 3476 J of heat per second with a temperature difference across the ends of 7?C. Compare this performance with the heat transfer of a solid silver bar of the same di- mensions by finding the rati..
A 0.245 kg ball is thrown straight up from 2.20 m above the ground. Calculate the total work done by the force of gravity during that time
A stone thrown off a bridge 20 m above a river has an initial velocity 14m/s of at an angle of 45 degrees above the horizontal. At what velocity does the stone strike the water
A 100-W resistance heater is connected to a 110-V doc source. What current flows through the heater
Two boats are heading away from shore. Boat 1 heads due north at a speed of 2.94 m/s relative to the shore. find the speed of the passenger relative to the shore
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